drivers/power/lp8727_charger.c

   1 /*
   2  * Driver for LP8727 Micro/Mini USB IC with integrated charger
   3  *
   4  *                      Copyright (C) 2011 Texas Instruments
   5  *                      Copyright (C) 2011 National Semiconductor
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/slab.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/i2c.h>
  17 #include <linux/power_supply.h>
  18 #include <linux/platform_data/lp8727.h>
  19
  20 #define LP8788_NUM_INTREGS      2
  21 #define DEFAULT_DEBOUNCE_MSEC   270
  22
  23 /* Registers */
  24 #define CTRL1           0x1
  25 #define CTRL2           0x2
  26 #define SWCTRL          0x3
  27 #define INT1            0x4
  28 #define INT2            0x5
  29 #define STATUS1         0x6
  30 #define STATUS2         0x7
  31 #define CHGCTRL2        0x9
  32
  33 /* CTRL1 register */
  34 #define CP_EN           (1 << 0)
  35 #define ADC_EN          (1 << 1)
  36 #define ID200_EN        (1 << 4)
  37
  38 /* CTRL2 register */
  39 #define CHGDET_EN       (1 << 1)
  40 #define INT_EN          (1 << 6)
  41
  42 /* SWCTRL register */
  43 #define SW_DM1_DM       (0x0 << 0)
  44 #define SW_DM1_U1       (0x1 << 0)
  45 #define SW_DM1_HiZ      (0x7 << 0)
  46 #define SW_DP2_DP       (0x0 << 3)
  47 #define SW_DP2_U2       (0x1 << 3)
  48 #define SW_DP2_HiZ      (0x7 << 3)
  49
  50 /* INT1 register */
  51 #define IDNO            (0xF << 0)
  52 #define VBUS            (1 << 4)
  53
  54 /* STATUS1 register */
  55 #define CHGSTAT         (3 << 4)
  56 #define CHPORT          (1 << 6)
  57 #define DCPORT          (1 << 7)
  58
  59 /* STATUS2 register */
  60 #define TEMP_STAT       (3 << 5)
  61
  62 enum lp8727_dev_id {
  63         ID_NONE,
  64         ID_TA,
  65         ID_DEDICATED_CHG,
  66         ID_USB_CHG,
  67         ID_USB_DS,
  68         ID_MAX,
  69 };
  70
  71 enum lp8727_chg_stat {
  72         PRECHG,
  73         CC,
  74         CV,
  75         EOC,
  76 };
  77
  78 struct lp8727_psy {
  79         struct power_supply ac;
  80         struct power_supply usb;
  81         struct power_supply batt;
  82 };
  83
  84 struct lp8727_chg {
  85         struct device *dev;
  86         struct i2c_client *client;
  87         struct mutex xfer_lock;
  88         struct delayed_work work;
  89         struct lp8727_platform_data *pdata;
  90         struct lp8727_psy *psy;
  91         struct lp8727_chg_param *chg_parm;
  92         enum lp8727_dev_id devid;
  93         unsigned long debounce_jiffies;
  94         int irq;
  95 };
  96
  97 static int lp8727_read_bytes(struct lp8727_chg *pchg, u8 reg, u8 *data, u8 len)
  98 {
  99         s32 ret;
 100
 101         mutex_lock(&pchg->xfer_lock);
 102         ret = i2c_smbus_read_i2c_block_data(pchg->client, reg, len, data);
 103         mutex_unlock(&pchg->xfer_lock);
 104
 105         return (ret != len) ? -EIO : 0;
 106 }
 107
 108 static inline int lp8727_read_byte(struct lp8727_chg *pchg, u8 reg, u8 *data)
 109 {
 110         return lp8727_read_bytes(pchg, reg, data, 1);
 111 }
 112
 113 static int lp8727_write_byte(struct lp8727_chg *pchg, u8 reg, u8 data)
 114 {
 115         int ret;
 116
 117         mutex_lock(&pchg->xfer_lock);
 118         ret = i2c_smbus_write_byte_data(pchg->client, reg, data);
 119         mutex_unlock(&pchg->xfer_lock);
 120
 121         return ret;
 122 }
 123
 124 static int lp8727_is_charger_attached(const char *name, int id)
 125 {
 126         if (name) {
 127                 if (!strcmp(name, "ac"))
 128                         return (id == ID_TA || id == ID_DEDICATED_CHG) ? 1 : 0;
 129                 else if (!strcmp(name, "usb"))
 130                         return (id == ID_USB_CHG) ? 1 : 0;
 131         }
 132
 133         return (id >= ID_TA && id <= ID_USB_CHG) ? 1 : 0;
 134 }
 135
 136 static int lp8727_init_device(struct lp8727_chg *pchg)
 137 {
 138         u8 val;
 139         int ret;
 140         u8 intstat[LP8788_NUM_INTREGS];
 141
 142         /* clear interrupts */
 143         ret = lp8727_read_bytes(pchg, INT1, intstat, LP8788_NUM_INTREGS);
 144         if (ret)
 145                 return ret;
 146
 147
 148         val = ID200_EN | ADC_EN | CP_EN;
 149         ret = lp8727_write_byte(pchg, CTRL1, val);
 150         if (ret)
 151                 return ret;
 152
 153         val = INT_EN | CHGDET_EN;
 154         ret = lp8727_write_byte(pchg, CTRL2, val);
 155         if (ret)
 156                 return ret;
 157
 158         return 0;
 159 }
 160
 161 static int lp8727_is_dedicated_charger(struct lp8727_chg *pchg)
 162 {
 163         u8 val;
 164         lp8727_read_byte(pchg, STATUS1, &val);
 165         return val & DCPORT;
 166 }
 167
 168 static int lp8727_is_usb_charger(struct lp8727_chg *pchg)
 169 {
 170         u8 val;
 171         lp8727_read_byte(pchg, STATUS1, &val);
 172         return val & CHPORT;
 173 }
 174
 175 static void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw)
 176 {
 177         lp8727_write_byte(pchg, SWCTRL, sw);
 178 }
 179
 180 static void lp8727_id_detection(struct lp8727_chg *pchg, u8 id, int vbusin)
 181 {
 182         struct lp8727_platform_data *pdata = pchg->pdata;
 183         u8 devid = ID_NONE;
 184         u8 swctrl = SW_DM1_HiZ | SW_DP2_HiZ;
 185
 186         switch (id) {
 187         case 0x5:
 188                 devid = ID_TA;
 189                 pchg->chg_parm = pdata ? pdata->ac : NULL;
 190                 break;
 191         case 0xB:
 192                 if (lp8727_is_dedicated_charger(pchg)) {
 193                         pchg->chg_parm = pdata ? pdata->ac : NULL;
 194                         devid = ID_DEDICATED_CHG;
 195                 } else if (lp8727_is_usb_charger(pchg)) {
 196                         pchg->chg_parm = pdata ? pdata->usb : NULL;
 197                         devid = ID_USB_CHG;
 198                         swctrl = SW_DM1_DM | SW_DP2_DP;
 199                 } else if (vbusin) {
 200                         devid = ID_USB_DS;
 201                         swctrl = SW_DM1_DM | SW_DP2_DP;
 202                 }
 203                 break;
 204         default:
 205                 devid = ID_NONE;
 206                 pchg->chg_parm = NULL;
 207                 break;
 208         }
 209
 210         pchg->devid = devid;
 211         lp8727_ctrl_switch(pchg, swctrl);
 212 }
 213
 214 static void lp8727_enable_chgdet(struct lp8727_chg *pchg)
 215 {
 216         u8 val;
 217
 218         lp8727_read_byte(pchg, CTRL2, &val);
 219         val |= CHGDET_EN;
 220         lp8727_write_byte(pchg, CTRL2, val);
 221 }
 222
 223 static void lp8727_delayed_func(struct work_struct *_work)
 224 {
 225         u8 intstat[2], idno, vbus;
 226         struct lp8727_chg *pchg =
 227             container_of(_work, struct lp8727_chg, work.work);
 228
 229         if (lp8727_read_bytes(pchg, INT1, intstat, 2)) {
 230                 dev_err(pchg->dev, "can not read INT registers\n");
 231                 return;
 232         }
 233
 234         idno = intstat[0] & IDNO;
 235         vbus = intstat[0] & VBUS;
 236
 237         lp8727_id_detection(pchg, idno, vbus);
 238         lp8727_enable_chgdet(pchg);
 239
 240         power_supply_changed(&pchg->psy->ac);
 241         power_supply_changed(&pchg->psy->usb);
 242         power_supply_changed(&pchg->psy->batt);
 243 }
 244
 245 static irqreturn_t lp8727_isr_func(int irq, void *ptr)
 246 {
 247         struct lp8727_chg *pchg = ptr;
 248
 249         schedule_delayed_work(&pchg->work, pchg->debounce_jiffies);
 250         return IRQ_HANDLED;
 251 }
 252
 253 static int lp8727_setup_irq(struct lp8727_chg *pchg)
 254 {
 255         int ret;
 256         int irq = pchg->client->irq;
 257         unsigned delay_msec = pchg->pdata ? pchg->pdata->debounce_msec :
 258                                                 DEFAULT_DEBOUNCE_MSEC;
 259
 260         INIT_DELAYED_WORK(&pchg->work, lp8727_delayed_func);
 261
 262         if (irq <= 0) {
 263                 dev_warn(pchg->dev, "invalid irq number: %d\n", irq);
 264                 return 0;
 265         }
 266
 267         ret = request_threaded_irq(irq, NULL, lp8727_isr_func,
 268                                 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 269                                 "lp8727_irq", pchg);
 270
 271         if (ret)
 272                 return ret;
 273
 274         pchg->irq = irq;
 275         pchg->debounce_jiffies = msecs_to_jiffies(delay_msec);
 276
 277         return 0;
 278 }
 279
 280 static void lp8727_release_irq(struct lp8727_chg *pchg)
 281 {
 282         cancel_delayed_work_sync(&pchg->work);
 283
 284         if (pchg->irq)
 285                 free_irq(pchg->irq, pchg);
 286 }
 287
 288 static enum power_supply_property lp8727_charger_prop[] = {
 289         POWER_SUPPLY_PROP_ONLINE,
 290 };
 291
 292 static enum power_supply_property lp8727_battery_prop[] = {
 293         POWER_SUPPLY_PROP_STATUS,
 294         POWER_SUPPLY_PROP_HEALTH,
 295         POWER_SUPPLY_PROP_PRESENT,
 296         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 297         POWER_SUPPLY_PROP_CAPACITY,
 298         POWER_SUPPLY_PROP_TEMP,
 299 };
 300
 301 static char *battery_supplied_to[] = {
 302         "main_batt",
 303 };
 304
 305 static int lp8727_charger_get_property(struct power_supply *psy,
 306                                        enum power_supply_property psp,
 307                                        union power_supply_propval *val)
 308 {
 309         struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
 310
 311         if (psp == POWER_SUPPLY_PROP_ONLINE)
 312                 val->intval = lp8727_is_charger_attached(psy->name,
 313                                                          pchg->devid);
 314
 315         return 0;
 316 }
 317
 318 static int lp8727_battery_get_property(struct power_supply *psy,
 319                                        enum power_supply_property psp,
 320                                        union power_supply_propval *val)
 321 {
 322         struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
 323         struct lp8727_platform_data *pdata = pchg->pdata;
 324         u8 read;
 325
 326         switch (psp) {
 327         case POWER_SUPPLY_PROP_STATUS:
 328                 if (lp8727_is_charger_attached(psy->name, pchg->devid)) {
 329                         lp8727_read_byte(pchg, STATUS1, &read);
 330                         if (((read & CHGSTAT) >> 4) == EOC)
 331                                 val->intval = POWER_SUPPLY_STATUS_FULL;
 332                         else
 333                                 val->intval = POWER_SUPPLY_STATUS_CHARGING;
 334                 } else {
 335                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 336                 }
 337                 break;
 338         case POWER_SUPPLY_PROP_HEALTH:
 339                 lp8727_read_byte(pchg, STATUS2, &read);
 340                 read = (read & TEMP_STAT) >> 5;
 341                 if (read >= 0x1 && read <= 0x3)
 342                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
 343                 else
 344                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
 345                 break;
 346         case POWER_SUPPLY_PROP_PRESENT:
 347                 if (!pdata)
 348                         return -EINVAL;
 349
 350                 if (pdata->get_batt_present)
 351                         val->intval = pchg->pdata->get_batt_present();
 352                 break;
 353         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 354                 if (!pdata)
 355                         return -EINVAL;
 356
 357                 if (pdata->get_batt_level)
 358                         val->intval = pchg->pdata->get_batt_level();
 359                 break;
 360         case POWER_SUPPLY_PROP_CAPACITY:
 361                 if (!pdata)
 362                         return -EINVAL;
 363
 364                 if (pdata->get_batt_capacity)
 365                         val->intval = pchg->pdata->get_batt_capacity();
 366                 break;
 367         case POWER_SUPPLY_PROP_TEMP:
 368                 if (!pdata)
 369                         return -EINVAL;
 370
 371                 if (pdata->get_batt_temp)
 372                         val->intval = pchg->pdata->get_batt_temp();
 373                 break;
 374         default:
 375                 break;
 376         }
 377
 378         return 0;
 379 }
 380
 381 static void lp8727_charger_changed(struct power_supply *psy)
 382 {
 383         struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
 384         u8 val;
 385         u8 eoc_level, ichg;
 386
 387         if (lp8727_is_charger_attached(psy->name, pchg->devid)) {
 388                 if (pchg->chg_parm) {
 389                         eoc_level = pchg->chg_parm->eoc_level;
 390                         ichg = pchg->chg_parm->ichg;
 391                         val = (ichg << 4) | eoc_level;
 392                         lp8727_write_byte(pchg, CHGCTRL2, val);
 393                 }
 394         }
 395 }
 396
 397 static int lp8727_register_psy(struct lp8727_chg *pchg)
 398 {
 399         struct lp8727_psy *psy;
 400
 401         psy = devm_kzalloc(pchg->dev, sizeof(*psy), GFP_KERNEL);
 402         if (!psy)
 403                 return -ENOMEM;
 404
 405         pchg->psy = psy;
 406
 407         psy->ac.name = "ac";
 408         psy->ac.type = POWER_SUPPLY_TYPE_MAINS;
 409         psy->ac.properties = lp8727_charger_prop;
 410         psy->ac.num_properties = ARRAY_SIZE(lp8727_charger_prop);
 411         psy->ac.get_property = lp8727_charger_get_property;
 412         psy->ac.supplied_to = battery_supplied_to;
 413         psy->ac.num_supplicants = ARRAY_SIZE(battery_supplied_to);
 414
 415         if (power_supply_register(pchg->dev, &psy->ac))
 416                 goto err_psy_ac;
 417
 418         psy->usb.name = "usb";
 419         psy->usb.type = POWER_SUPPLY_TYPE_USB;
 420         psy->usb.properties = lp8727_charger_prop;
 421         psy->usb.num_properties = ARRAY_SIZE(lp8727_charger_prop);
 422         psy->usb.get_property = lp8727_charger_get_property;
 423         psy->usb.supplied_to = battery_supplied_to;
 424         psy->usb.num_supplicants = ARRAY_SIZE(battery_supplied_to);
 425
 426         if (power_supply_register(pchg->dev, &psy->usb))
 427                 goto err_psy_usb;
 428
 429         psy->batt.name = "main_batt";
 430         psy->batt.type = POWER_SUPPLY_TYPE_BATTERY;
 431         psy->batt.properties = lp8727_battery_prop;
 432         psy->batt.num_properties = ARRAY_SIZE(lp8727_battery_prop);
 433         psy->batt.get_property = lp8727_battery_get_property;
 434         psy->batt.external_power_changed = lp8727_charger_changed;
 435
 436         if (power_supply_register(pchg->dev, &psy->batt))
 437                 goto err_psy_batt;
 438
 439         return 0;
 440
 441 err_psy_batt:
 442         power_supply_unregister(&psy->usb);
 443 err_psy_usb:
 444         power_supply_unregister(&psy->ac);
 445 err_psy_ac:
 446         return -EPERM;
 447 }
 448
 449 static void lp8727_unregister_psy(struct lp8727_chg *pchg)
 450 {
 451         struct lp8727_psy *psy = pchg->psy;
 452
 453         if (!psy)
 454                 return;
 455
 456         power_supply_unregister(&psy->ac);
 457         power_supply_unregister(&psy->usb);
 458         power_supply_unregister(&psy->batt);
 459 }
 460
 461 static int lp8727_probe(struct i2c_client *cl, const struct i2c_device_id *id)
 462 {
 463         struct lp8727_chg *pchg;
 464         int ret;
 465
 466         if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
 467                 return -EIO;
 468
 469         pchg = devm_kzalloc(&cl->dev, sizeof(*pchg), GFP_KERNEL);
 470         if (!pchg)
 471                 return -ENOMEM;
 472
 473         pchg->client = cl;
 474         pchg->dev = &cl->dev;
 475         pchg->pdata = cl->dev.platform_data;
 476         i2c_set_clientdata(cl, pchg);
 477
 478         mutex_init(&pchg->xfer_lock);
 479
 480         ret = lp8727_init_device(pchg);
 481         if (ret) {
 482                 dev_err(pchg->dev, "i2c communication err: %d", ret);
 483                 return ret;
 484         }
 485
 486         ret = lp8727_register_psy(pchg);
 487         if (ret) {
 488                 dev_err(pchg->dev, "power supplies register err: %d", ret);
 489                 return ret;
 490         }
 491
 492         ret = lp8727_setup_irq(pchg);
 493         if (ret) {
 494                 dev_err(pchg->dev, "irq handler err: %d", ret);
 495                 lp8727_unregister_psy(pchg);
 496                 return ret;
 497         }
 498
 499         return 0;
 500 }
 501
 502 static int __devexit lp8727_remove(struct i2c_client *cl)
 503 {
 504         struct lp8727_chg *pchg = i2c_get_clientdata(cl);
 505
 506         lp8727_release_irq(pchg);
 507         lp8727_unregister_psy(pchg);
 508         return 0;
 509 }
 510
 511 static const struct i2c_device_id lp8727_ids[] = {
 512         {"lp8727", 0},
 513         { }
 514 };
 515 MODULE_DEVICE_TABLE(i2c, lp8727_ids);
 516
 517 static struct i2c_driver lp8727_driver = {
 518         .driver = {
 519                    .name = "lp8727",
 520                    },
 521         .probe = lp8727_probe,
 522         .remove = __devexit_p(lp8727_remove),
 523         .id_table = lp8727_ids,
 524 };
 525 module_i2c_driver(lp8727_driver);
 526
 527 MODULE_DESCRIPTION("TI/National Semiconductor LP8727 charger driver");
 528 MODULE_AUTHOR("Woogyom Kim <milo.kim@ti.com>, "
 529               "Daniel Jeong <daniel.jeong@ti.com>");
 530 MODULE_LICENSE("GPL");